Looks like the "Ivanka celebrating Sabbath, Donald goes berserk" theory may be true.

Day After Frosty Merkel Meeting, Trump Slams Germany Over NATO
-Bloomberg [www.bloomberg.com]
President Donald Trump, less than 24 hours after an awkward first meeting with Chancellor Angela Merkel that highlighted their divides on policy and personality, said Germany must pay the U.S. more for providing defense.